4). n^2-9/4cn+81/64c^2=(n)^2-2*9/8cn+(9/8c)^2=(n-9/8c)^2; 6). t^2-17/5dt+289/100d^2=(t)^2-2*17/10dt+(17/10d)^2=(t-17/10d)^2.
9 + 30x - 100 = 2
30x = 102 - 9
30x = 93
x = 93/30
x = 3, 1
1 (a+3)²
2 (x-2)²
3 (5m+1)²
4 (2n-3k)²
5(y+1)²
6(1-b)²
7 (a+8)²
8 (3c²-5b)²
1) ( 2 ^ 11 ) * ( 3 ^ 11 ) = 6 ^ 11
2) ( 6 ^ 11 ) : ( 6 ^ 9 ) = 6 ^ 2 = 36
3) ( 7/4 ) ^ 0 = 1
4) 36 + 1 = 37